2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1258
Ignition ON, command the battery pack vent fan speed to 60 percent duty cycle with a scan tool. The battery pack vent fan should turn ON after
approximately a 10 second delay.
Circuit/System Testing
Danger: Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal
Protection Equipment (PPE) and proper procedures must be followed.
The High Voltage Disabling procedure will perform the following tasks:
* Identify how to disable high voltage.
* Identify how to test for the presence of high voltage.
* Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must
be followed.
Before working on any high voltage system, be sure to wear the following Personal Protection Equipment:
* Safety glasses with appropriate side shields when within 50 feet of the vehicle, either indoors or outdoors.
* Certified and up-to-date Class "0" Insulation gloves rated at 1000V with leather protectors.
- Visually and functionally inspect the gloves before use.
- Wear the Insulation gloves at all times when working with the high voltage battery assembly, whether the system is energized or
not.
Failure to follow the procedures exactly as written may result in serious injury or death.
Note: Perform the Generator Battery Vent Fan test first
Generator Battery Vent Fan Test
1. Ignition OFF, disable the high voltage at the drive motor generator battery. Refer to High Voltage Disabling ().
2. Ignition OFF, disconnect the generator battery vent fan.
3. Connect the 12 V battery.
4. Test for less than 5 ohm between the generator battery vent fan ground circuit terminal 3 and ground
瀚慖f greater than the specified range, test the ground circuit for an open/high resistance.
5. Connect a test lamp between the control circuit terminal 2 and the ground circuit terminal 3.
6. Command the battery pack vent fan speed between 0 and 60 percent with a scan tool. The test lamp should turn ON and OFF after a 10
second delay.
瀚慖f the test lamp does not turn ON and OFF, refer to Generator Battery Vent Fan Relay test.
7. Connect a DMM between the control circuit terminal 4 and ground.
8. Command the battery vent fan to 60 percent with a scan tool. Test for less than 1 V after a 10 second delay.
瀚慖f greater than the specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the drive motor
generator battery control module.
9. Command the battery vent fan to 0 percent with a scan tool. Switch the DMM to the diode test. The DMM reading should display O.L.
瀚慖f less than the specified value, test the control circuit for a short to ground. If the circuits test normal, replace the drive motor generator
battery control module.
10. Command the battery vent fan to 60 percent with a scan tool. The reading should be less than 3 V.
瀚慖f less than the specified range or displaying O.L., test the control circuit for an open/high resistance. If the circuits test normal, replace
the drive motor generator battery control module.
Generator Battery Vent Fan Relay Test
1. Disconnect the harness connector at the battery vent fan relay.
2. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal 4 and ground.
瀚慖f the test lamp illuminates, test the control circuit for a short to voltage.
3. Verify that a test lamp illuminates between the B+ circuit terminal 3 and ground.
